Fix #67: Update hero CTA and speaking page reel placeholder

- Change homepage hero CTA from 'Watch the Reel' to 'Explore Speaking'
- Update speaking page reel placeholder to acknowledge missing video
- Add direction to signature talks below the reel placeholder

- Hero images exist in public/images/
- Favicon exists (favicon.ico and favicon.svg)
- Manifest.json exists

src/pages/index.astro

@@ -30,7 +30,7 @@ import PillarCard from '../components/PillarCard.astro';
       </p>
       <div class="hero-actions">
         <a href="/speaking#book" class="btn btn-primary" data-umami-event="hero-cta-book">Book Scott for Your Event</a>
-        <a href="/speaking" class="btn btn-outline" data-umami-event="hero-cta-reel">Watch the Reel</a>
+        <a href="/speaking" class="btn btn-outline" data-umami-event="hero-cta-reel">Explore Speaking</a>
         <a href="/downloads/Scott-Scoble-Human-Cultivation-Expert-Speaker-Profile.pdf" class="btn btn-outline" download data-umami-event="hero-cta-profile">📄 Speaker Profile</a>
       </div>
     </div>